Wow definitely bringing back repressed memories for me - my audi s8 for whatever reason would refuse to stream via a2dp unless I had some music actually on the phone, in which case it would auto play said music after some random delay. So my brilliant solution was a 5 second silent mp3 loaded on my phone - it would keep the bt gods happy and i could switch to a2dp at my leisure. This was perfect, until someone decided to force deploy the same half naked men on my phone.
